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Journal of Materials Engineering and Performance

Erschienen in:

01.01.2015

A Modified Johnson-Cook Constitutive Equation to Predict Hot Deformation Behavior of Ti-6Al-4V Alloy

verfasst von: Jun Cai, Kuaishe Wang, Peng Zhai, Fuguo Li, Jie Yang

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 1/2015

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Abstract

A modified Johnson-Cook constitutive equation of Ti-6Al-4V alloy is proposed based on hot compression tests performed in the temperature range of 1073-1323 K and strain rate 0.001-1 s⁻¹. The experimental stress-strain data were employed to develop the modified Johnson-Cook constitutive equation of different phase regimes (α + β and β phase). The predicted flow stresses using the developed equation were compared with experimental data. Correlation coefficient (R) and average absolute relative error (AARE) were introduced to verify the validity of the constitutive equation. The values of R and AARE for α + β phase were 0.990 and 7.81%, respectively. And in β phase region, the values of R and AARE were 0.985 and 10.36%, respectively. Meanwhile, the accuracy, the number of material constants involved, and the computational time required of the constitutive equation were evaluated by comparing with a strain-compensated Arrhenius-type constitutive equation. The results indicate that accuracy of modified Johnson-Cook constitutive equation is higher than that of compensated Arrhenius-type model at α + β phase, while lower at single β phase region. Meanwhile, the time required for evaluating the material constants of modified Johnson-Cook constitutive equation is much shorter than that of the strain-compensated Arrhenius type ones.

Vorheriger Artikel Solution Treatment and Aging (STA) Study of Ti Alloy Ti5Al3Mo1.5V

Nächster Artikel Effects of Carbon Structure and Mixing Sequence in an Expander on the Capacity of Negative Electrodes in a Traction Battery

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Titel: A Modified Johnson-Cook Constitutive Equation to Predict Hot Deformation Behavior of Ti-6Al-4V Alloy
verfasst von: Jun Cai
Kuaishe Wang
Peng Zhai
Fuguo Li
Jie Yang
Publikationsdatum: 01.01.2015
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 1/2015
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-014-1243-x

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